Pump device



Feb. 9, 1965 w. F. scHULTz PUMP DEVICE 6 Sheets-Sheet 1 Filed June 11,1962 Feb. 9, 1965 w. F. scHuLTz 3,168,858

' PUMP DEVICE Filed June 11. 1962 e sheets-sheet 2 I INVENTOR Fl g. 5Werner Schu/lz His f/orney Feb. 9, 1965 w. F. scHuLTz PUMP DEVICE 6Sheets-Sheet 3 Filed June 1l, 1962 mvENToR. Werner Schu/fz H/'s fforneyFeb. 9, 1965 w. F. scHuLTz 3,168,868

PUMP DEVICE Filed June 1l, 1962 6 Sheets-Sheet 4 F ig. /3

INVENTOR Werner F Schu/lz F g. /2 BY Z H/'s //orney Feb. 9, 1965 w. F.scHULTz 3,168,858

PUMP DEVICE Filed June ll, 1962 6 Sheets-Sheet 5 INVENTOK Werner FSchu/fz Fig. /6` BY H/'s A fforney Feb- 9, 1965 w. F. scHULTz 3,168,868

PUMP DEVICE Filed June l1, 1962 6 Sheets-Sheet 6 INVENTOR. WernerSchu/fz BY United States Patent O 3,168,868 PUMP DEVICE Werner F.Schultz, Flint, Mich., assignor to General Motors Corporation, Detroit,Mich., a corporation of Delaware Filed June 11, 1962, Ser. No. 201,61610 Claims. (Cl. 103-87) This invention relates to a compact assembly ofparts of combined electric-fluid motor means and, more particularly, toan electric fuel pump unit.

An object of this invention is to provide a new and improved structuralarrangement of motor-pump components easy to assemble into a compactunit Without need for screw fasteners, yet having proper alignment andconcentricity between stator and rotor parts with a minimum ofelectrical circuitry.

Another object of this invention is to provide an electric fuel pumpassembly including a centrifugal pump portion and electric motor portionwhich share a rotating part supported and located by a single bearingmeans in a unitary body portion disposed toward one end of a suitableshaft of the rotating part and having a sheet metal cover carrying anelectrical stator axially mountable to one side of the unitary bodyportion, the unitary body portion being a central part to which allother parts are assembled.

Another object of this invention is to provide an electric motor statorportion for use with an electric fuel pump assembly including acentrifugal pump portion on one side of a unitary angular body portionnotched along one side thereof to complement a cup-like cover orsubstant-ially cylindrical case portion into which permanent magnetsealed means can be press-fitted to have correct alignment axially of asingle bearing means located in the unitary body portion onto which thecover or case portion interlocks with a snap fit of at least one inwardprojection thereof against the unitary body portion where notched, therebeing a single shaft journalled by the single bearing means andsupporting a pump impeller on one end thereof as well as wound motorrotor means on an opposite end thereof.

A further object of this invention to provide an electric fuel pumpactuated by a direct current motor having a single bearing means forrotor support with a concentric commutator means fastened directly to anarmature core and located circumferentially to the bearing means toresult in optimum condit-ions of concentricity maintained as to aunitary body portion to which all other parts are assembled includingpivotally mounted brush means to engage the concentric commutator meanson a side of the body portion opposite to a side where a centrifugalpump portion with impeller is located.

Another object of this invention is to provide an electric fuel pumpactuated by a direct current motor having a bearing means for woundrotor-commutator support and a concentrically mounted stationary iieldmeans on one side of a unitary bodyportion having a centrifugal pumpportion with impeller on an opposite side thereof, a brush assembly alsocarried by the unitary body portion and including armlike insulatingmeans pivotally retained therewith by ring means without requiringseparate brush rigging and having brushes on pairs of arm-likeinsulating means to which a cable and sheath thereof are connectedrespectively, each arm-like insulating means having a pivot projectionat an end thereof remote from the brush carried thereby and located in arecess also provided in the unitary body portion.

Another object of this invention is to provide an electric fuel pumpactuated by a direct current motor having a unitary base part ofrnoldable plastic material centrally to receive bearing means forrotor-commutator shaft support and a concentrically mounted stationaryfield means on one side thereof as well as a centrifugal pump portionwith impeller on an opposite side thereof, a brush assembly also carriedby the unitary base part and including al brush means without pigtailthough each with a holder thereof of stripslike metal having an indentedgenerally L-shaped pivot end that engages a metal support strip one endof which has a connector pin means to hold the support strip to theunitary base and to project therethrough for direct external electricalconnection thereto, the pivot end of the metal brush holder havingdirect engagement against an elb0w-like end of the support strip While asubstantially U-looped or modied elliptical spring means straddles theelbow-l-ike end of the support strip and the indented generally L-shapedpivot end of the metal brush holder biased radially inwardly thereby tourge engagement of the brush means against the commutator.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings wherein preferred embodiments of the present invention areclearly shown.

In the drawings:

FIGURE 1 is a top end view of an electric fuel pump assembly inaccordance with the present invention.

FIGURE 2 is an elevational cross-sectioned view taken along line 2-2 inFIGURE 1.

FIGURE 3 is a view taken of unitary body portion in the direction ofarrow 3 in the assembly of ,FIGURE 2.

FIGURE 4 is a cross-sectional view taken along line 4 4 in FIGURE 3.

FIGURE 5 is a cross-sectional view taken along line 5-5 in FIGURE 3.

FIGURE 6 is a plan view of the unitary body portion as seen from theelectric motor side thereof.

FIGURE 7 is a side view of shaft-mounted wound rotor-commutator meansfor use in the electric fuel pump assembly in accordance with thepresent invention.

FIGURE 8 is an end view of the rotor-commutator means taken in thedirection of arrow 8 in FIGURE 7.

FIGURE 9 is a diagrammatic illustration of interconnection of the woundrotor-commutator means of FIG- URES 7 and 8.

FIGURE 10 is a plan view of pump impeller means for use in the electricfuel pump assembly having an end plate outlined therewith.

FIGURE l1 is a plan view to illustrate screen and pump inlet ports onthe electric fuel pump assembly in accordance with the presentinvention.

FIGURE 12 is a plan view of a pad-like base support ring to tcircumferentially around the unitary body portion of the electric fuelpump assembly in accordance with the present invention.

FIGURE 13 is a fragmentary side view of the support ring of FIGURE 12.

FIGURE 14 is an end view of a subassembly of stator field means and acylindrical cover or case portion for use with the electric fuel pumpassembly in accordance with the present invention.

FIGURE 15 is a partially sectioned side View of the subassembly ofFIGURE 4.

FIGURE 16 is a plan View of brush and arm-like insulating support meanstherewith as well as sheath-cable connection thereto in accordance withthe present inventlon.

FIGURE 17 is a sectional View of modified electric fuel pump assemblytaken through line 17-17 in FIGURE 18 further in accordance with thepresent invention.

FIGURE 18 is a cross-sectional View taken along line 18-18 in FIGURE 17.

FIGURE 19 is a side view of the brush assembly per se taken in thedirection of arrow 19 in FIGURE 18.

There is continued emphasis on improvement of components for increaseddurability and reliability while facilitating production at reducedcosts and increasing compactness of such components including,particularly, electric motor fea-tures feasible for driving an electricfuel pump means as well as a fan, blower, or other types of impeller orpump means where close coupling of the motor and the load is desirable.The drawings illustrate improved structural arrangement of combinedelectric-fluid motor means generally indicated by numeral 20. Thiscombined electric-fluid motor means 20 can include a base or unitarybody portion 21 generally annular in shape as apparent in FIGURE l aswell as in FIGURE 3 and FIGURE 6. This base or unitary body portion canbe made as a metal die casting or molding or other suitable materialhaving an integral upwardly extending annular projection 22 with apassage therethrough into which a pipe or tube means 23 can be fittedand held by a suitable spring retainer clip 24 as shown in FIGURE 2.This tube or pipe means 23 provides a conduit connection to an outputchamber 25 visible in FIGURES 2, 3 and 5 of the drawings. This outputchamber 25 communicates with a substantially annular recess 26peripherally thereof wherein an impeller or pump blade means 27 with acentral integral hub portion 28 is provided. The impeller and integralhub portion thereof can be seen in views of FIGURES 2 and l0 of thedrawings and this impeller and integral hub portion can be mounted bypress-tit and the like to one end of a single shaft 29 that can be seenin views of FIGURES 2, 7 and l0 of the drawings. This single shaft 29 isjournalled for rotation in a single sleeve-like bearing means 30press-fitted axially into an opening of a hub-like extension orprojection 31 of the unitary body portion. The single bearing means 30can be made of lubricant-impregnated sintered metal as well as otherlong-wearing metal alloy materials, and it is to be noted thatsubstantially onehalf of the length of this bearing means ispress-fitted into the hub-like extension 31 of the unitary body portion21 while a remaining half of the bearing means projects axiallytherefrom in a direction away from the end of the shaft where the pumpimpeller means is mounted. The shaft 29 can be provided with spiralgrooves 32 as shown in FIGURE 7 for passage and distribution of fluidfor lubricating purposes peripherally between the shaft and bearingmeans 30. The pump-motor means in accordance with the present inventionis intended for use submerged in fuel such as gasoline and othercombustible liquid materials subject to displacement from a container orstorage means 33 outlined in FIGURE 2. Thus, liquid fuel in such astorage means 33 can be used directly for limited removal from chamber26 by the spiral grooves 32 along a lower periphery of the shaft 29which projects at one end into the chamber 26 wherein liquid fuel isavailable and is adapted to be centrifugally pumped into the outputchamber 25 in a well-known manner. Some liquid fuel used for lubricatingpurposes is distributed over bearing surfacing by the spiral grooves 32and this fuel can escape from motor space through case openings. Thegrooves provide only a very limited pumping action of such liquid fuelfor lubricating purposes between the shaft and the bearing means 30.

The shaft 29 also carries a slotted magnetic core 34 adjacent to an endthereof remote from the end to which the pump impeller means ispress-fitted. This slotted magnetic core 34 can be seen in views ofFIGURES 2, 7 and 8 as well as diagrammatically in FIGURE 9. The magneticcore can be made by a stacking of a plurality of metal laminations orotherwise, and splines 35 extending longitudinally near one end of theshaft 29 can project outwardly for press-fitting of the magnetic core 34thereon. A rotor winding means 36 can be fitted into the slots of themagnetic core 34 and can include a plurality of coils or elementselectrically connected at predetermined locations to a plurality ofcommutator segments 37 as diagrammatically represented in FIGURE 9. Eachof the commutator segments 37 includes a relatively flat central bodyportion with opposite curved ends 38 forming a generally C-shapedconfiguration except for a projection 39 extending laterally awaytherefrom for connection of predetermined leads to the winding 36 asindicated particularly in FIGURE 2. Each of the commutator segments 37is anchored by the opposite curved ends 38 to an insulating sleeve means40, which can have saw cuts produced therein during manufacturingprocedure of cutting an annular copper ring into commutator segments,which is concentrically fitted axially against the magnetic core 34insulated from the windings 36 subsequently added thereto as shown inFIGURE 2. This insulating sleeve member 40 is further held by a coveringof plastic core insulating material 41 which encapsulates the magneticcore 34 due to dipping in plastic material or coating in a fluidized bedsuch that an end of the covering 41 adjament to the commutator meansbecomes bonded peripherally to the insulating sleeve member 40 for atleast a quarter of the axial length of the member 40. VThe sleeve member40 of insulating material is thus pre-positioned to be locatedconcentrically around an intermediate portion of the shaft 29 thoughspaced radially outwardly therefrom for a predetermined distance topermit fitting thereof telescopically around the free or exposed end ofthe bearing means 30 noted earlier. This telescopic fitting of the freeor exposed end of the bearing means 3G relative to the commutator meansand insulating sleeve member 40 concentrically relative to the shaft 29can be seen in FIGURE 2 and represents improvement for campactness whilerequiring only the single bearing means 30 for journalling of the shaft29 that carries the pump impeller means as well as the motor rotor atopposite ends thereof. The bearing means 30, in effect, journals theshaft centrally while opposite ends of the shaft carry the rotor of theelectric motor means as well as the pump impeller means as illustrated.Parts such as the base portion 121 as well as cover plate and impeller27-28 can be made from acetal resin material available commercially asknown by a trade name Delfin themoplastic which is a polymer ofrepeating -CHzO- groups.

The shaft 29 is substantially vertically located and thus the bearingmeans 30 provides lateral or radial support during operation of theassembly. The lower end of the shaft 29 can be provided with opposite atportions 42 such that the impeller hub can be press-fitted thereto andan end recess 43 in the shaft receives a ball 44 of hardened metalpress-fitted therein which projects axially therefrom at least in partfor vertical support of the shaft directly on a metal plate 45 as can beseen in FIGURE 2. This plate 45 iits adjacent to one side of the unitarybody portion 21 and closes off one side of the output chamber 25 as wellas the pump or impeller chamber 26. This plate 45 has pump inletpassages 46 as indicated in FIG- URES 2 `and l() and locatedconcentrically at a predetermined diameter about axis of rotation ofshaft 29 carrying the motor rotor and pump impeller means. The plate 45also includes an outwardly extending projection 47 which complements anotch or cutout in the unitary body portion 2l such that the inletpassages 46 are necessarily properly aligned relative to axis ofrotation of the shaft 29 upon installation of the plate 45 relative tothe motor-pump assembly.

Mounted adjacent to the plate 45 along an underside thereof there is afine mesh screen means 48 having a plurality of projections 49 visible`in FIGURES 2 and 1l such that the screen is spaced axially away fromthe plate 45 and a filtering occurs as to the inlet passages 46 in theplate 45. An annular retainer 50 visible in FIG- URE 2 can bepress-fitted to the unitary body portion 2l thus serving to hold theplate and screen in a proper location for pump functioning. Ring means51 of ilexible, extensible insulating material can be slip-fitted aroundthe base portion 21 peripherally thereof as a resilient mountingincluding downwardly extending projections 52 visible in FIGURES 2, 12and 13. These projections 52 provide necessary elevation of theinsulating ring means 51 from a bottom of the container 33 to assurepassage of the `liquid fuel or gasoline and the like to an underside ofthe screen for inlet through the passages 46 of the pumping means drivenby the electric motor and having features in accordance with the presentinvention. An annular metal bracket 53 `slip-fitted peripherally aroundthe ring means 51 can be provided with plural legs or outwardlyextending lateral lugs 54 that support the entire motor-pump assemblyand that can be suitably fastened down on the container 33 along thebottom thereof. These lugs are best seen in the view of FIGURE 1 and inthe cross-sectional view of FIGURE 2.

The unitary body portion 21 includes a plurality of webs 56 integraltherewith as apparent in views in FIGURES 2 and 4-6. These webs orwall-like projections extend laterally outwardly and include severalcutouts or notches for differing purposes. An upper notch 57 is adaptedto be engaged by an inwardly extending tang 58 struck from a cup-likedownwardly extending body 59 of a cover pontion 60 having a dome-likeupper end providing sufficient space thereunder for rotor windings 36carried by the magnetic core 34 on the shaft 29. A lower peripheral edgeof the body 59 of the cover portion 60 can abut against .the unitarybody portion 21 forming a seal therewith and a lower notch 61 in the webmeans receives a ringr-like spring means 62 held ltherein by a lower endor skirt or the body 59. An opposite lateral portion of the ring 62resiliently engages a notch 63 of an arm-like insulating means 64 havinga pivotal end 65 engaged into a pivotal cutout 66 between the extension31 and integral base portion 21 as best seen in the view of FIGURE 2. Anend of the arm-like insulating'means 64 remote from the pivotal end 65has a recess 67 therein adapted to receive a brush means 68, the freeend of which engages commutator segments 37. The spring ring 62 urgesengagement of the brush means 68 against the commutator segments 37. Thebrush means 68 of ca rbonaceous material can be fitted to the recess 67by a press-fit and the views of FIGURES 2 and 16 provide furtherdetailed showing thereof. It is to be noted that a conductor 70 suitablyinsulated from a sheath 72 can be provided such that the sheathestablishes connection to one of the brush means while the conductor 70can provide electrical connection to another of a pair of the brushmeans as indicated in FIGURE 16.

Further details of the cover portion 60 including the cylindrical body59 thereof that tapers slightly outwardly can be seen in views ofFIGURES 14 and 15 Stator eld means including a pair of arcuate shapedpermanent magnets 71 can be press-fitted into engagement with an innerperiphery of the body 59 and cover portion 60 such that a pair ofdiametrically oppositely located U-shaped spring metal clips 73 can urgethe permanent magnets away from each other and into engagement with thebody 59 and cover portion 60. The permanent magnet stator field meanscan be seen in views of FIGURES 2, 14 and 15. The permanent magnetstator field means 71 has a predetermined location to be radially inalignment with the rotor magnetic core 34 and windings 36 therewith. Itis to be understood that auxiliary fins 76 extending in pairs inopposite directions can augment proper positioning of the body 59 andcover portion 60 relative to the unitary base portion 21 and these fins76 can be seen in views of FIGURES 4-6 inclusive. In effect, the fieldor stationary portion of the motor consists of two separate pieces orone single ring of permanent magnet material disposed inside thecylindrical body 59 of metal such as steel pre-assembled to each otherand then press-fitted as a cover portion onto predetermined projectionson the unitary base portion 21 for properly locating and retaining themotor field in proper relationship to other parts. Predeterminedindentations or dimples can be provided by the webs engageable by thecylindrical body 59 to assure correct alignment of the field structureand the cover portion can be removed from the base portion by a twistingand disengagement of the tangs and inter'fitting parts.

In the structure illustrated by FIGURES 1 through 16 it is apparent thatng separate brush rigging is required because the insulatingarm-likemeans which support and locate the brushes are pivotally journalled byrecess-like indentations 66 in the central base portion. Due torelationship of necessary parts, electrical circuitry is reduced to aminimum. Features of particular importance include use of a singlebearing means to support a rotating shaft or member that carries boththe rotor of a direct current motor as well as an impeller means of apump, fan and the like. This single bearing means extends concentricallyinside a commutator means so as to provide support in close proximity tothe armature core of the rotor where forces of the motor are developedand must be met. The commutator is located circumferentially outside thebearing along substantially one-half thereof thereby resulting inoptimum conditions of concentricity for the entire length of thecommutator means. The commutator means is fastened directly to thearmature core simultaneously during insulating of the rotor core. Themagnetic eld and motor case are a pre-assembly fitlted simultaneously tothe base portion and the field structure is supported and located byinterlock of tangs or projections with recesses on webs or projectionsof the base portion. The brush holders, brush spring as Well as theconnections to land securing of the power supply cable to the brushesinvolving use of a shielded insulated conductor can result in aminimizing of electrical connections. Use of screw fasteners for theassembly can be avoided though the motor parts are secured in properrelationship while allowing for disassembly. Access to the brush meansis facilitated though use of the insulating brush supports in arrn-likeconfiguration can result in increased length of service of the brushesper se. The entire assembly provides a compact though readily accessibleassembly of parts without screw fasteners of any type. It is to be notedthat features in accordance with the present invention can be utilizedon a motor-fuel pump means disclosed with a Motor Energizing Circuit ofa copending application Serial No. 70,506 filed November 18, 1960, andbelonging to the assignee of the present invention.

FIGURE 17 provides a sectional view of a modified electric-fluid motormeans in accordance with the present invention and generally indicatedby numeral 120. A unitary base portion completely of insulating materialis indicated by a numeral 121 and a bottom cover plate 145 ispress-fitted thereto and held together by a metal bracket means 153. Thebase portion together with the cover plate 145 form an outlet chamber125 extending tangentially outwardly from a fluid pump chamber 126formed therebetween. An impeller blade means 127 including a central hub128 press-fitted to a unitary shaft 129 can be provided as describedearlier and this shaft 129 is centrally journalled relative to a singlesleeve-like bearing means 130 press-fitted to an extension 131 ofinsulating material integral with the base portion 121. The bearingmeans 130 is press-fitted into engagement with an inner periphery of theextension 131 for at least one-half the length of the bearing means anda magnetic rotor core 134 is press-fitted to an end of a shaft 129remote from the end to which the impeller means is press-fitted. In theillustration of FIGURE 18 it can be seen that the upper end of thesleeve-like bearing means provides a thrust support S for a lower sideof the magnetic core 134 which carries rotor windings 136 as well as anannular insulating member 140 for commutator segments 137 having projections 139 therewith. Permanent magnet stator field means 171 can bepress-fitted and held to a cylindrical body 159 of a cover portion 160of metal such as steel in a manner similar to that described forstructure of FIG- URE 2. In the FIGURE 18 embodiment there is anenlarged annular lower end E of the cylindrical body 159 and coverportion 160 though the lower edge thereof fits into a groove G of thebase portion of insulating material indicated by numeral 121 and webs orlaterally outwardly extending projections 156 assure proper positioningof the cover portion and cylindrical body and extension E thereof.

The plate 145 can include an inlet opening 146 centrally thereof and afilter means 148 can be provided laterally thereabout. A pair ofdiagonally located supports 152 can be provided by the joining of thebase portion 121 and cover plate 145 of insulating material. Elastomericbushings B together with metal clips C can fit complementary to thesesupports 152 for maintaining proper positioning of the assembly assubmerged in a tank or container for liquid fuel, gasoline and the like.

FIGURES 17, 18 and 19 illustrate a modification in brush assemblywhereby a brush means 168 best seen in FIGURE 18 can be held by metalbrush holder means 164 having a generally L-shaped pivot end 165 whichengages an elbow-like end 195 of a metal support strip 196 one end 197of which is held'in place by a connector pin means 198 press-fittedthrough the unitary base portion 121 of insulating material and coverplate 145 to leave a prong end 199 thereof projecting for directexternal electrical connection thereto by suitable terminal means. Asubstantially U-looped or modified elliptical spring means 200 straddlesthe elbow-like end 195 of the support strip 196 and a recess or indent201 of the L-shaped pivot end 165 of the metal brush holder is biasedradially inwardly thereby to urge engagement of the brush means 168against the commutator segments 137. This modification of the brushassembly eliminates wiring connections thereto and provides a brushwithout pigtail to' be held by a sheet metal stamping of suitablematerial such as brass, the lower end of which nests in a bend in astrip of similar material positioned and retained by the base molding ofinsulating material as well as a knurled connector pin 198 press-fittedthereto with a projecting prong end 199 externally accessible. A datstrip of spring material such as beryllium copper in a U-looped orelliptical configuration as indicated by reference numeral 200 ispositioned into the indented portions or recesses of the L- shaped endof the brush holder and elbow-like end 195 of the support strip 196thereby maintaining the holder in proper position relative to thesupporting strip while having the spring means enhance electricalconnection between the holder and strip in spite of the pivotalconnection therebetween. External electrical connection to the motorportion of the assembly can be readily made to a pair of connection pinswith suitable connectors. Use of the structure of FIGURES 17, 18 and 19permits elimination of any soldering of brush pigtails while retainingfunctions of the unitary base portion as described earlier.

While the embodiments of the present invention as lherein disclosedconstitute preferred forms, it is to be understood that other formsmight be adopted.

What is claimed is as follows:

1. Structural arrangement comprising, a unitary body portion having ahub-like central projection as well as web means integral therewith, acup-like cover portion adapted to interlock over said web means andcarrying a motor stator means therein, brush means pivotally journalledoutwardly from said hub-like central projection in space between saidcover portion and web means, a rotormeans disposed radially inwardly ofsaid motor stator means and having a commutator axially on one sidethereof toward said brush means, a mechanical load exemplified by animpeller powered during stator and rotor energization, a common shaftextending axially to opposite sides of said unitary body portion withsaid mechanical load carried adjacent to one side thereof and said rotormeans on an opposite side remote therefrom, and a single bearing meanspress-fitted into said hub-like central projection of said unitary bodyportion which assures maintenance of proper alignment for both saidmechanical load and motor rotor-stator means.

2. The arrangement of claim l wherein said single bearing means has asleeve-like configuration substantially half of which engages saidunitary body portion and a remaining half of which extends about saidshaft to a l0- cation concentrically within said commutator.

3. The arrangement of claim l wherein a screen and perforated coverplate are pressed against the mechanical load side of said unitary bodyportion and said mechanical load exemplified by the impeller includes abladed member of plastic material fitted directly to an end of saidshaft at a location remote from said rotor means, said bladed memberproviding a pumping action for transfer of liquid medium by way of inletand outlet passages access to which occurs through a screen andperforated cover plate secured to said unitary body portion.

4. The arrangement of claim l wherein said brush means include arm-likeportions of insulating material to receive brush elements at one end andhaving an integral pivot projection located inwardly at an opposite end,and a wire-like spring retainer to embrace said unitary body portion andarm-like portion in assembled relationship.

5. The arrangement of claim 1 wherein said stator means includes a pairof semi-arcuate permanent magnets press-fitted to an inner periphery ofsaid cover portion, and a pair of substantially.diametrically oppositeU- shaped clip means to maintain positioning of said magnets radiallyoutside said rotor means and within said cover portion adjacent to oneend thereof.

6. The arrangement of claim 1 wherein said cover portion includes alower skirt-like end which engages said unitary body portion by tanginterlock and which retains a wire-like brush spring means in positionfor centrally biasing said brush means against said commutator.

7. The arrangement of cla-im 1 wherein said brush means include a metalholder having an indented L- shaped pivot end remote from abrush-element carrying end, a metal support strip having an elbow-likeend and a substantially U-looped elliptical spring means that straddlessaid elbow-like end of said support strip and said indented generallyL-shaped pivot end of said metal brush holder biased radially inwardlythereby to urge engagement of the brush means against the commutator,said body portion being made of insulating material engageable by saidmetal support strip held thereto by a pin member having an externallyengageable prong end projecting through said body portion for electricalconnection thereto.

u 8. The arrangement of claim 1 wherein a screen filter 1s carried bysaid body portion for inlet opening protection, and downwardly extendingmounting lugs are provided for spacing said body portion to permit fiuidaccess to said mechanical load which is an electric fuel pump impeller.

9. Structural arrangement for an electric fuel pump assembly,comprising, a unitary body portion having a hub-like central projectionvwith a passage therethrough as well as web means integral therewith, acup-like cover portion adapted to interlock over said web means andcarrying a motor stator means therein, brush means pivotally journalledoutwardly from said hub-like central projection in space between saidcover portion and web means, a rotor means disposed radially inwardly ofsaid motor stator means and having a commutator axially on one sidethereof toward said brush means, a fuel pump impeller load poweredduring electrical energization of said stator and rotor means, a commonshaft extending axially to opposite `sides of ysaid unitary body portionwith said fuel pump impeller load carried adjacent to one side thereofand said rotor means on an opposite side remote therefrom, and a singlesleeve bearing means provided peripherally in the passage through saidprojection such as by molding integrally as well as press-fittedtherethrough, said single sleeve bearing means assuring maintenance ofproper alignment for both said fuel pump impeller load and motorrotor-stator means.

10. The arrangement of claim 9 wherein a screen lter is carried by saidbody portion for pump inlet protection and said stator means includes apair of semi-arcuate permanent magnets press-fitted to an innerperiphery of said cover portion and resilient clip means to maintainpositioning of said magnets radially outside said rotor means and withinsaid cover portion adjacent to one end thereof.

References Cited in the file of this patent UNITED STATES -PATENTSPeterson Aug. 11, 1908 Richter Aug. 15, 1922 Starker Sept. 12, 1922Haldeman et al July 9, 1935 Arnold Dec. 14, 1937 Ingersoll Aug. 10, 1943Hansen et al. Feb. 29, 1944 Ericson Aug. 18, 1953 Wightman Apr. 9, 1957Cralle et al. Jan. 8, 1963

1. STRUCTURAL ARRANGEMENT COMPRISING, A UNITARY BODY PORTION HAVING AHUB-LIKE CENTRAL PROJECTION AS WELL AS WEB MEANS INTEGRAL THEREWITH, ACUP-LIKE COVER PORTION ADAPED TO INTERLOCK OVER SAID WEB MEANS ANDCARRYING A MOTOR STATOR MEANS THEREIN, BRUSH MEANS PIVOTALLY JOURNALLEDOUTWARDLY FROM SAID HUB-LIKE CENTRAL PROJECTION IN SPACE BETWEEN SAIDCOVER PORTION AND WEB MEANS, A ROTOR MEANS DISPOSED RADIALLY INWARDLY OFSAID MOTOR STATOR MEANS AND HAVING A COMMUTATOR AXIALLY ON ONE SIDETHEREOF TOWARD SAID BRUSH MEANS, A MECHANICAL LOAD EXEMPLIFIED BY ANIMPELLER POWERED DURING STATOR AND ROTOR ENERGIZATION, A COMMON SHAFTEXTENDING AXIALLY TO